Definition of TILLAMOOK. 1. a: a Salishan people of the Oregon coast b: a member of such people. 2.
That her roommates remember to walk the new puppy = clause as antecedent; it = personal pronoun. Other times, the antecedent might be the word, phrase, or clause that a demonstrative pronoun replaces.
It is a typical linguistic term and originates from grammar. Often antecedents and their respective pronouns agree in number, which means if an antecedent is singular, the pronoun that replaces it will also be singular. However, sometimes writers might not follow this rule, and we see singular antecedents are replaced with plural pronouns.